CONTROL PANEL (TYPE 5)
SYSTEMS OPERATION
Return of Commercial (Normal) Power
When commercial power returns, the automatic transfer switch
transfers the load to commercial power. Remote start initiating contacts
(1) open. This de-energizes run relay (RR).
When run relay (RR) is de-energized, contacts (RR2) close and
contacts (RR1) open. (RR2) closed completes a circuit to shut-off
solenoid (SS). The shut-off solenoid moves the rack to the fuel OFF
position. (RR1) opens to de-energize the arming relay (AR).
After the engine stops, (TDX) contact will open to de-energize the
shut-off solenoid.
NOTE: TDX is operated by the TDR time delay relay. It has a
fixed delay on drop out of 70 seconds. This means, the
shut-off solenoid will remain energized for 70 seconds each
time the unit is shutdown.
Diode (Dl) is in the shut-off solenoid circuit to help prevent electrical
sparks (arcing), at the shut-off solenoid contacts, when the shut-off
solenoid is de-energized.
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